The current thesis focuses on Rich Internet Applications development using with the Google Web Toolkit. Through literature study sought the features of Web 2.0 that can be placed on such an application using the toolkit of Google. Capstone of the GWT evaluation as such a tool is designing and developing an application for administrating and service delivering functions of a car rental business. This experience is the main source for producing conclusions about the appropriateness of GWT as a tool for developing RIAs.